The stock regulator is below average
Doesn't come with an ASA
Poor stock feeneck

Review:

I purchased this marker November 2004 after doing some online comparisons between the Promaster, Ion and Wrath. I eventually chose the Promaster after reading those reviews and I'm very happy with my choice.
The Promaster feels sturdy without being heavy. In fact, it felt very light to me after lugging around my ICD Desert Fox for several years. I fitted it with a unimount to keep the weight down and the profile low. I had to fit it with something because an ASA is not provided by the factory. Anyhow, the marker's small size made for a comfortable, tight shooting position. Good marks in this area... The feeneck, however, needs to be replaced. Adding this subpar feedneck was obviously a way to keep costs down. This was the first thing I replaced.
Because this was my first electronic marker, I was amazed at how light the trigger pull was, but after testing out a friend's Timmy, I realized the trigger is very good, but not great. After some adjustment, the trigger pull was nice and short, but there was still a tiny bit of play there. Note that this doen't cost $1000 though, and on the field, I was able to keep up with people shooting those premium markers. Overall, I was very pleased.
After playing all day, the last thing you feel like doing is maintenance. Luckily very little is required in the care for this marker. Cleaning and lubing takes just a few minutes and you are ready for your next outing.
The regulator was the next problem I encountered with this marker. When I first purchased the marker, it was quite an air hog and my FPS varied by about +/- 10 FPS even after shooting through 2 cases of paint. I upgraded the regulator to an AKA 2-Liter and that fixed the problem of shot consistancy and also gave me a few more shots from my tank. I haven't upgraded anything else involved with the operation of the marker and it has worked flawlessly for over one year. With the excellent build quality and no exposed hoses or plastics, this marker is definitely worth the money.

Conclusion:

The poor stock regulator and feedneck and lack of an ASA bring the rating down a little, but ease of maintenance and excellent performance still allow me to highly recommend this marker.